For example, a VLAN interface or an Ethernet interface on a router connected to a Cisco switch or segregated by a layer 2 VLAN. To configure an IP helper address you’ll use the ip helper-address a.b.c.d in interface configuration mode on the interface that is connected to the broadcast domain in which you wish to provide DHCP IP addresses. DHCP IP Helper addresses are IP addresses configured on a routed interface such as a VLAN Interface or a routers Ethernet interface that allows that specific device to act as a “middle man” which forwards BOOTP (Broadcast) DHCP request it receives on an interface to the DHCP server specified by the IP Helper address via unicast. Many people wonder how this works but the answer is quite simple. ![]() So have you ever wondered how a single DHCP server can provide DHCP IP addresses to every PC on the network when the DHCP server is not on the same broadcast domain? After all DHCP request are broadcast request right?
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